V4L/DVB (11078): au0828: properly handle non-existent analog inputs

It is not valid to look for dev->board.input == NULL to detect an undefined
analog configuration section, since it is a member of the struct and not a
pointer (hence it will *always* be non-NULL).  Do the check based on whether
the first input is actually a valid input type instead.

Thanks to Michael Krufky <mkrufky@linuxtv.org> for providing sample hardware
of various configurations to test with.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/au0828/au0828-core.c b/drivers/media/video/au0828/au0828-core.c
index 2b5ade6..5199c8a 100644
--- a/drivers/media/video/au0828/au0828-core.c
+++ b/drivers/media/video/au0828/au0828-core.c
@@ -146,7 +146,7 @@
 	/* Digital TV */
 	au0828_dvb_unregister(dev);
 
-	if (dev->board.input != NULL)
+	if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 		au0828_analog_unregister(dev);
 
 	/* I2C */
@@ -205,7 +205,7 @@
 	au0828_card_setup(dev);
 
 	/* Analog TV */
-	if (dev->board.input != NULL)
+	if (AUVI_INPUT(0).type != AU0828_VMUX_UNDEFINED)
 		au0828_analog_register(dev, interface);
 
 	/* Digital TV */